import UIKit
import Foundation

// MARK: - math
struct Math: Codable {
    let classes: [Class]?
}

// MARK: - Class
struct Class: Codable {
    let calculus: [Calculus]?
}

// MARK: - Calculus
struct Calculus: Codable {
    let question: String?
    let answer: Answer?
}

enum Answer: String, Codable {
    case answer = "answer"
}
let url = URL(string: "https://1416baef.ngrok.io")
let request = NSMutableURLRequest(url:url!);
let task = URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) in
    if error == nil {
        let math = try? JSONDecoder().decode(Math.self, from: data!)

        for i in (0...math!.classes![0].calculus!.count) {
            print(math!.classes![0].calculus![i].question!)
            print(math!.classes![0].calculus![i].answer!)
        }
    }
    else {
        print(error ?? "error within error")
    }
}
task.resume()